Time And Epochs

Overview Dates Time And Calendars#

Some information on Overview Dates Time And Calendars.

Microsoft TIME#

Microsoft TIME is different.


The timestamp, as used in the UUID RFC 4122 is a 60 bit value, representing the number of 100 nanosecond intervals since 15 October 1582 00:00:000000000 This guarantees that there would be no duplicates in UUID until 3400 AD. (Then What? ;-) )

Unix Time#

Unix Time is a NumericDate


OpenVMS, it's 00:00:00 of November 17, 1858 (base date of the United States Naval Observatory's ephemerides)


Macintosh, it's the midnight beginning January 1 1904. (MacOS Epoch)

System time is measured in seconds or Tick past the epoch.

More Information#

There might be more information for this subject on one of the following: